01514aam 2200421I 450 991071122460332120151113033703.0GOVPUB-C13-ff8dc22d75e66f29ebdb2bb2085ee683(CKB)5470000002481778(OCoLC)929066506(EXLCZ)99547000000248177820151113d1983 ua 0engrdacontentrdamediardacarrierSize of letters required for visibility as a function of viewing distance and observer visual acuity /Gerald L. HowettGaithersburg, MD :U.S. Dept. of Commerce, National Institute of Standards and Technology,1983.1 online resourceNBS technical note ;11801983.Contributed record: Metadata reviewed, not verified. Some fields updated by batch processes.Title from PDF title page.Includes bibliographical references.LetteringVisual acuityLettering.Visual acuity.Howett Gerald Leonard1931-1402680Howett Gerald Leonard1931-1402680United States.National Bureau of Standards.NBSNBSGPOBOOK9910711224603321Size of letters required for visibility as a function of viewing distance and observer visual acuity3527808UNINA